Anthony Martial will be assessed on Sunday before Louis van Gaal decides whether the Frenchman is fit to face West Ham on Tuesday.

Martial was named in the Dutchman's team to face Norwich on Saturday before picking up a hamstring injury in the warm up.

And Van Gaal admitted he doesn't know whether the 20-year-old will be fit to play at Upton Park.

He said: "Anthony felt something and I'm a manager who is not taking risks. Especially not in his situation and I said this to Anthony because he has played most of all the matches, like Daley Blind and Chris Smalling.

"He is 20 years old. I have to take care of him so he didn't play and Wayne had to play the striker's position. He gave an assist to Juan Mata and it has been solved very well."

"When a player says he feels something, he shall not play. I think you have to be fit, especially in this weather as that is a big difference. We have to see on Sunday if the muscle is tight."